Johanna Basford is one of the best-known adult coloring book authors — her hit book, Secret Garden, sold more than 10 million copies worldwide.

Spooky Halloween Coloring Page ($2) If you're looking for something cute and simple, this adult coloring page is a great way to start. It has all the quintessential Halloween themes; we're talking ...

This book is the number 13 best-selling nonfiction book on Amazon. Adults will love its humor and there’s nothing offensive in its pages. So kids can color, too.

Some of the most popular coloring book companies, like PCG Publishing Group, LLC which sold over 1 million coloring books and had 3 Amazon #1 best-sellers last year, have been successful with ...